dataset_code/sekai/offload/dummy_dataloader_official.py

import os
import pickle
import random
import numpy as np
import pandas as pd
from collections import defaultdict

import torch
import torchvision
from torch.utils.data import DataLoader, Dataset, Sampler

from video_reader import PyVideoReader

from diffusers.utils import export_to_video
from diffusers.training_utils import free_memory

# 5:  (21, 41,  61,  81, 101)
# 6:  (25, 49,  73,  97, 121)
# 7:  (29, 57,  85, 113, 141)
# 8:  (33, 65,  97, 129, 161)
# 9:  (37, 73, 109, 145, 181)
# 10: (41, 81, 121, 161, 201)
# 11: (45, 89, 133, 177, 221)
# 12: (49, 97, 145, 193, 241)

# 1:  (21 - 1) * 4 + 1 = 81,  162
# 2:  (22 - 1) * 4 + 1 = 85,  170
# 3:  (23 - 1) * 4 + 1 = 89,  178
# 4:  (24 - 1) * 4 + 1 = 93,  186
# 5:  (25 - 1) * 4 + 1 = 97,  194
# 6:  (26 - 1) * 4 + 1 = 101, 202
# 7:  (27 - 1) * 4 + 1 = 105, 210
# 8:  (28 - 1) * 4 + 1 = 109, 218
# 9:  (29 - 1) * 4 + 1 = 113, 226
# 10: (30 - 1) * 4 + 1 = 117, 234
# 11: (31 - 1) * 4 + 1 = 121, 242
# 12: (32 - 1) * 4 + 1 = 125, 250
# 13: (33 - 1) * 4 + 1 = 129, 258
# 14: (34 - 1) * 4 + 1 = 133, 266
# 15: (35 - 1) * 4 + 1 = 137, 274
# 16: (36 - 1) * 4 + 1 = 141, 282

resolution_bucket_options = {
    640: [
        (768, 320),
        (768, 384),
        (640, 384),
        (768, 512),
        (576, 448),
        (512, 512),
        (448, 576),
        (512, 768),
        (384, 640),
        (384, 768),
        (320, 768),
    ],
}

length_bucket_options = {
    1: [321, 301, 281, 261, 241, 221, 193, 181, 161, 141, 121, 101, 81, 61, 41, 21],
    2: [193, 177, 161, 156, 145, 133, 129, 121, 113, 109, 97, 85, 81, 73, 65, 61, 49, 37, 25],
}

def find_nearest_resolution_bucket(h, w, resolution=640):
    min_metric = float('inf')
    best_bucket = None
    for (bucket_h, bucket_w) in resolution_bucket_options[resolution]:
        metric = abs(h * bucket_w - w * bucket_h)
        if metric <= min_metric:
            min_metric = metric
            best_bucket = (bucket_h, bucket_w)
    return best_bucket

def find_nearest_length_bucket(length, stride=1):
    buckets = length_bucket_options[stride]
    min_bucket = min(buckets)
    if length < min_bucket:
        return length
    valid_buckets = [bucket for bucket in buckets if bucket <= length]
    return max(valid_buckets)

def read_cut_crop_and_resize(video_path, f_prime, h_prime, w_prime, stride=1):
    vr = PyVideoReader(video_path, threads=0) # 0 means auto (let ffmpeg pick the optimal number)
    total_frames = len(vr)

    if stride != 1:
        required_span = stride * (f_prime - 1)
        start_frame = max(0, total_frames - required_span - 1)
    else:
        start_frame = max(0, total_frames - f_prime)

    frame_indices = list(range(start_frame, total_frames, stride))
    assert len(frame_indices) == f_prime
    frames = torch.from_numpy(vr.get_batch(frame_indices)).float()


    # if stride != 1:
    #     required_span = stride * (f_prime - 1)
    #     start_frame = max(0, total_frames - required_span - 1)
    #     frame_indices = list(range(start_frame, total_frames, stride))
    #     assert len(frame_indices) == f_prime
    #     frames = torch.from_numpy(np.stack(vr.decode_fast(start_frame=0, end_frame=total_frames))).float()
    #     frames = frames[frame_indices]
    # else:
    #     start_frame = max(0, total_frames - f_prime)
    #     frames = torch.from_numpy(np.stack(vr.decode_fast(start_frame=start_frame, end_frame=total_frames))).float()


    # total_frames = len(vr)
    # start_frame = max(0, total_frames - f_prime)
    # # frame_indices = list(range(start_frame, total_frames))
    # # frames = torch.from_numpy(vr.get_batch(frame_indices)).float()
    # frames = torch.from_numpy(np.stack(vr.decode_fast(start_frame=start_frame, end_frame=total_frames))).float()


    frames = (frames / 127.5) - 1
    video = frames.permute(0, 3, 1, 2)

    frames, channels, h, w = video.shape
    aspect_ratio_original = h / w
    aspect_ratio_target = h_prime / w_prime

    if aspect_ratio_original >= aspect_ratio_target:
        new_h = int(w * aspect_ratio_target)
        top = (h - new_h) // 2
        bottom = top + new_h
        left = 0
        right = w
    else:
        new_w = int(h / aspect_ratio_target)
        left = (w - new_w) // 2
        right = left + new_w
        top = 0
        bottom = h

    # Crop the video
    cropped_video = video[:, :, top:bottom, left:right]
    # Resize the cropped video
    resized_video = torchvision.transforms.functional.resize(cropped_video, (h_prime, w_prime))
    return resized_video

def save_frames(frame_raw, fps=24, video_path="1.mp4"):        
    save_list = []
    for frame in frame_raw:
        frame = (frame + 1) / 2 * 255
        frame = torchvision.transforms.transforms.ToPILImage()(frame.to(torch.uint8)).convert("RGB")
        save_list.append(frame)
        frame = None
        del frame
    export_to_video(save_list, video_path, fps=fps)
    
    save_list = None
    del save_list
    free_memory()

class BucketedFeatureDataset(Dataset):
    def __init__(self, csv_file, video_folder, stride=1, cache_file=None, force_rebuild=False):
        self.csv_file = csv_file
        self.video_folder = video_folder
        self.stride = stride
        
        if cache_file is None:
            cache_file = os.path.join(video_folder, f"dataset_cache_stride{stride}.pkl")

        if force_rebuild or not os.path.exists(cache_file):
            print("Building metadata cache...")
            self._build_metadata()
            self._save_cache(cache_file)
        else:
            print("Loading cached metadata...")
            with open(cache_file, "rb") as f:
                cached_data = pickle.load(f)
            if cached_data.get("stride", 1) != stride:
                print(f"Stride mismatch in cache (cached: {cached_data.get('stride', 1)}, current: {stride}). Rebuilding...")
                self._build_metadata()
                self._save_cache(cache_file)
            else:
                self.samples = cached_data["samples"]
                self.buckets = cached_data["buckets"]
                print(f"Loaded {len(self.samples)} samples from cache")
        

    def _save_cache(self, cache_file):
        print("Saving metadata cache...")
        cached_data = {
            "samples": self.samples, 
            "buckets": self.buckets,
            "stride": self.stride
        }
        with open(cache_file, "wb") as f:
            pickle.dump(cached_data, f)
        print(f"Cached {len(self.samples)} samples with stride={self.stride}")

    # def _build_metadata(self):
    #     self.feature_files = [f for f in os.listdir(self.video_folder) if f.endswith(".mp4")]
    #     self.samples = []
    #     self.buckets = defaultdict(list)
    #     sample_idx = 0

    #     print(f"Processing {len(self.feature_files)} files...")
    #     for i, feature_file in enumerate(self.feature_files):
    #         if i % 10000 == 0:
    #             print(f"Processed {i}/{len(self.feature_files)} files")

    #         video_path = os.path.join(self.video_folder, feature_file)

    #         # Parse filename
    #         parts = feature_file.split("_")[:4]
    #         uttid = parts[0]
    #         num_frame = int(parts[1])
    #         height = int(parts[2])
    #         width = int(parts[3].replace(".mp4", ""))

    def _build_metadata(self):
        self.df = pd.read_csv(self.csv_file)
        
        self.samples = []
        self.buckets = defaultdict(list)
        sample_idx = 0
        
        print(f"Processing {len(self.df)} records from CSV with stride={self.stride}...")
        for i, row in self.df.iterrows():
            if i % 10000 == 0:
                print(f"Processed {i}/{len(self.df)} records")
            
            uttid = os.path.basename(row['videoFile']).replace(".mp4", "")
            video_file = row['videoFile']
            video_path = os.path.join(self.video_folder, video_file)
            prompt = row["caption"]
            num_frame = row["num_frame"]
            height = row["height"]
            width = row["width"]
            fps = row["fps"]

            # # keep length >= 121
            # if num_frame < 121:
            #     continue

            effective_num_frame = (num_frame + self.stride - 1) // self.stride
            bucket_height, bucket_width = find_nearest_resolution_bucket(height, width, resolution=640)
            bucket_num_frame = find_nearest_length_bucket(effective_num_frame, stride=self.stride)
            bucket_key = (bucket_num_frame, bucket_height, bucket_width)

            sample_info = {
                "uttid": uttid,
                "bucket_key": bucket_key,
                "video_path": video_path,
                "prompt": prompt,
                "fps": fps,
                "stride": self.stride,
                "effective_num_frame": effective_num_frame,
                "num_frame": num_frame,
                "height": height,
                "width": width,
                "bucket_num_frame": bucket_num_frame,
                "bucket_height": bucket_height,
                "bucket_width": bucket_width,
            }

            self.samples.append(sample_info)
            self.buckets[bucket_key].append(sample_idx)
            sample_idx += 1

    def __len__(self):
        return len(self.samples)

    def __getitem__(self, idx):
        # sample_info = self.samples[idx]
        # video_data = read_cut_crop_and_resize(
        #     video_path=sample_info["video_path"],
        #     f_prime=sample_info["bucket_num_frame"],
        #     h_prime=sample_info["bucket_height"],
        #     w_prime=sample_info["bucket_width"],
        #     stride=self.stride,
        # )
        while True:
            sample_info = self.samples[idx]
            try:
                video_data = read_cut_crop_and_resize(
                    video_path=sample_info["video_path"],
                    f_prime=sample_info["bucket_num_frame"],
                    h_prime=sample_info["bucket_height"],
                    w_prime=sample_info["bucket_width"],
                    stride=self.stride,
                )
                break
            except Exception:
                idx = random.randint(0, len(self.samples) - 1)
                print(f"Error loading {sample_info['video_path']}, retrying...")

        return {
            "uttid": sample_info["uttid"],
            "bucket_key": sample_info["bucket_key"],
            "video_metadata": {
                "num_frames": sample_info["bucket_num_frame"],
                "height": sample_info["bucket_height"],
                "width": sample_info["bucket_width"],
                "fps": sample_info["fps"],
                "stride": self.stride,
                "effective_num_frame": sample_info["effective_num_frame"],
            },
            "videos": video_data,
            "prompts": sample_info["prompt"],
            "first_frames_images": (video_data[0] + 1) / 2 * 255,
        }

class BucketedSampler(Sampler):
    def __init__(self, dataset, batch_size, drop_last=False, shuffle=False, seed=42):
        self.dataset = dataset
        self.batch_size = batch_size
        self.drop_last = drop_last
        self.shuffle = shuffle
        self.seed = seed
        self.generator = torch.Generator()
        self.buckets = dataset.buckets
        self._epoch = 0

    def set_epoch(self, epoch):
        self._epoch = epoch

    def __iter__(self):
        if self.shuffle:
            self.generator.manual_seed(self.seed + self._epoch)
        else:
            self.generator.manual_seed(self.seed)

        bucket_iterators = {}
        bucket_batches = {}

        for bucket_key, sample_indices in self.buckets.items():
            indices = sample_indices.copy()
            if self.shuffle:
                indices = torch.randperm(len(indices), generator=self.generator).tolist()
                indices = [sample_indices[i] for i in indices]

            batches = []
            for i in range(0, len(indices), self.batch_size):
                batch = indices[i : i + self.batch_size]
                if len(batch) == self.batch_size or not self.drop_last:
                    batches.append(batch)

            if batches:
                bucket_batches[bucket_key] = batches
                bucket_iterators[bucket_key] = iter(batches)

        remaining_buckets = list(bucket_iterators.keys())

        while remaining_buckets:
            idx = torch.randint(len(remaining_buckets), (1,), generator=self.generator).item()
            bucket_key = remaining_buckets[idx]

            bucket_iter = bucket_iterators[bucket_key]

            try:
                batch = next(bucket_iter)
                yield batch
            except StopIteration:
                remaining_buckets.remove(bucket_key)

    def __len__(self):
        total_batches = 0
        for sample_indices in self.buckets.values():
            num_batches = len(sample_indices) // self.batch_size
            if not self.drop_last and len(sample_indices) % self.batch_size != 0:
                num_batches += 1
            total_batches += num_batches
        return total_batches


def collate_fn(batch):
    def collate_dict(data_list):
        if isinstance(data_list[0], dict):
            return {
                key: collate_dict([d[key] for d in data_list])
                for key in data_list[0]
            }
        elif isinstance(data_list[0], torch.Tensor):
            return torch.stack(data_list)
        else:
            return data_list
    
    return {
        key: collate_dict([d[key] for d in batch])
        for key in batch[0]
    }


if __name__ == "__main__":
    from accelerate import Accelerator

    base_name = "sekai-game-drone"
    csv_file = f"/mnt/bn/yufan-dev-my/ysh/Ckpts/Lixsp11/0_final_sekai_dataset/yamls/{base_name}_updated.csv"
    video_folder = f"/mnt/bn/yufan-dev-my/ysh/Ckpts/Lixsp11/0_final_sekai_dataset/{base_name}"
    stride = 1
    batch_size = 2
    num_train_epochs = 1
    seed = 0
    output_dir = "accelerate_checkpoints"
    checkpoint_dirs = (
        [
            d
            for d in os.listdir(output_dir)
            if d.startswith("checkpoint-") and os.path.isdir(os.path.join(output_dir, d))
        ]
        if os.path.exists(output_dir)
        else []
    )

    dataset = BucketedFeatureDataset(csv_file=csv_file, video_folder=video_folder, stride=stride)
    sampler = BucketedSampler(dataset, batch_size=2, drop_last=False, shuffle=True, seed=seed)
    dataloader = DataLoader(dataset, batch_sampler=sampler, collate_fn=collate_fn, num_workers=8)

    print(len(dataset), len(dataloader))
    accelerator = Accelerator()
    dataloader = accelerator.prepare(dataloader)
    print(f"Dataset size: {len(dataset)}, Dataloader batches: {len(dataloader)}")
    print(f"Process index: {accelerator.process_index}, World size: {accelerator.num_processes}")

    step = 0
    global_step = 0
    first_epoch = 0
    num_update_steps_per_epoch = len(dataloader)

    print("Testing dataloader...")
    step = global_step
    for epoch in range(first_epoch, num_train_epochs):
        sampler.set_epoch(epoch)
        skip_steps = 0
        printed_skip_log = False
        for i, batch in enumerate(dataloader):
            if epoch == first_epoch and skip_steps < (global_step % num_update_steps_per_epoch):
                skip_steps += 1
                continue
            if epoch == first_epoch and not printed_skip_log:
                print(f"Skip {skip_steps} steps in epoch {epoch}")
                printed_skip_log = True

            # Get metadata
            uttid = batch["uttid"]
            bucket_key = batch["bucket_key"]
            num_frame = batch["video_metadata"]["num_frames"]
            height = batch["video_metadata"]["height"]
            width = batch["video_metadata"]["width"]

            # Get feature
            video_data = batch["videos"]
            prompt = batch["prompts"]
            first_frames_images = batch["first_frames_images"]
            first_frames_images = [torchvision.transforms.ToPILImage()(x.to(torch.uint8)) for x in first_frames_images]

            # import pdb;pdb.set_trace()
            # save_frames(video_data[0].squeeze(0), video_path="1.mp4")

            if accelerator.process_index == 0:
                # print info
                print(f" Step {step}:")
                print(f"  Batch {i}:")
                print(f"  Batch size: {len(uttid)}")
                print(f"  Uttids: {uttid}")
                print(f"  Dimensions - frames: {num_frame[0]}, height: {height[0]}, width: {width[0]}")
                print(f"  Bucket key: {bucket_key[0]}")
                print(f"  Videos shape: {video_data.shape}")
                print(f"  Cpation: {prompt}")

                # verify
                assert all(nf == num_frame[0] for nf in num_frame), "Frame numbers not consistent in batch"
                assert all(h == height[0] for h in height), "Heights not consistent in batch"
                assert all(w == width[0] for w in width), "Widths not consistent in batch"

                print("  ✓ Batch dimensions are consistent")

            step += 1